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I will need model on thermostat to give specific instructions.Model will be inside front cover or perhaps you can send a picture or identify your thermostat for me.
If you don't have model or a pic, take a look at this site.Scroll through and see if you can tell me which you have
Since you do not want a schedule lets first make sure thermostat is configured for manual operation.See link below for instructions. Make sure function 120 is set to 0